Sorry, I missed the wagon aspect. Not sure how that changes the weight balance.
Square setup will give the best handling, and reduce understeer. If you are running summer tires, you shouldn't have an issue with traction with a square setup.
I put the Active Autowerke on my 340, but winter Pirelli's just don't cut it for traction. It'll break the tires loose at 70kph during the 2-3 upshift if you are hard on the throttle.
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